[PATCH v9 01/27] cxl: add type2 device basic support

[<alejandro.lucero-palau@amd.com>]

From: Alejandro Lucero <alucerop@amd.com>

Differentiate CXL memory expanders (type 3) from CXL device accelerators
(type 2) with a new function for initializing cxl_dev_state.

Create accessors to cxl_dev_state to be used by accel drivers.

Based on previous work by Dan Williams [1]

Link: [1] https://lore.kernel.org/linux-cxl/168592160379.1948938.12863272903570476312.stgit@dwillia2-xfh.jf.intel.com/
Signed-off-by: Alejandro Lucero <alucerop@amd.com>
Co-developed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/cxl/core/memdev.c | 51 +++++++++++++++++++++++++++++++++++++++
 drivers/cxl/core/pci.c    |  1 +
 drivers/cxl/cxlpci.h      | 16 ------------
 drivers/cxl/pci.c         | 13 +++++++---
 include/cxl/cxl.h         | 24 ++++++++++++++++++
 include/cxl/pci.h         | 23 ++++++++++++++++++
 6 files changed, 108 insertions(+), 20 deletions(-)
 create mode 100644 include/cxl/cxl.h
 create mode 100644 include/cxl/pci.h

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index ae3dfcbe8938..99f533caae1e 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -7,6 +7,7 @@
 #include <linux/slab.h>
 #include <linux/idr.h>
 #include <linux/pci.h>
+#include <cxl/cxl.h>
 #include <cxlmem.h>
 #include "trace.h"
 #include "core.h"
@@ -616,6 +617,25 @@ static void detach_memdev(struct work_struct *work)
 
 static struct lock_class_key cxl_memdev_key;
 
+struct cxl_dev_state *cxl_accel_state_create(struct device *dev)
+{
+	struct cxl_dev_state *cxlds;
+
+	cxlds = kzalloc(sizeof(*cxlds), GFP_KERNEL);
+	if (!cxlds)
+		return ERR_PTR(-ENOMEM);
+
+	cxlds->dev = dev;
+	cxlds->type = CXL_DEVTYPE_DEVMEM;
+
+	cxlds->dpa_res = DEFINE_RES_MEM_NAMED(0, 0, "dpa");
+	cxlds->ram_res = DEFINE_RES_MEM_NAMED(0, 0, "ram");
+	cxlds->pmem_res = DEFINE_RES_MEM_NAMED(0, 0, "pmem");
+
+	return cxlds;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_accel_state_create, "CXL");
+
 static struct cxl_memdev *cxl_memdev_alloc(struct cxl_dev_state *cxlds,
 					   const struct file_operations *fops)
 {
@@ -693,6 +713,37 @@ static int cxl_memdev_open(struct inode *inode, struct file *file)
 	return 0;
 }
 
+void cxl_set_dvsec(struct cxl_dev_state *cxlds, u16 dvsec)
+{
+	cxlds->cxl_dvsec = dvsec;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_dvsec, "CXL");
+
+void cxl_set_serial(struct cxl_dev_state *cxlds, u64 serial)
+{
+	cxlds->serial = serial;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_serial, "CXL");
+
+int cxl_set_resource(struct cxl_dev_state *cxlds, struct resource res,
+		     enum cxl_resource type)
+{
+	switch (type) {
+	case CXL_RES_DPA:
+		cxlds->dpa_res = res;
+		return 0;
+	case CXL_RES_RAM:
+		cxlds->ram_res = res;
+		return 0;
+	case CXL_RES_PMEM:
+		cxlds->pmem_res = res;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_resource, "CXL");
+
 static int cxl_memdev_release_file(struct inode *inode, struct file *file)
 {
 	struct cxl_memdev *cxlmd =
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index b3aac9964e0d..ec57caf5b2d7 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright(c) 2021 Intel Corporation. All rights reserved. */
+#include <cxl/pci.h>
 #include <linux/units.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/device.h>
diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
index 4da07727ab9c..eb59019fe5f3 100644
--- a/drivers/cxl/cxlpci.h
+++ b/drivers/cxl/cxlpci.h
@@ -14,22 +14,6 @@
  */
 #define PCI_DVSEC_HEADER1_LENGTH_MASK	GENMASK(31, 20)
 
-/* CXL 2.0 8.1.3: PCIe DVSEC for CXL Device */
-#define CXL_DVSEC_PCIE_DEVICE					0
-#define   CXL_DVSEC_CAP_OFFSET		0xA
-#define     CXL_DVSEC_MEM_CAPABLE	BIT(2)
-#define     CXL_DVSEC_HDM_COUNT_MASK	GENMASK(5, 4)
-#define   CXL_DVSEC_CTRL_OFFSET		0xC
-#define     CXL_DVSEC_MEM_ENABLE	BIT(2)
-#define   CXL_DVSEC_RANGE_SIZE_HIGH(i)	(0x18 + (i * 0x10))
-#define   CXL_DVSEC_RANGE_SIZE_LOW(i)	(0x1C + (i * 0x10))
-#define     CXL_DVSEC_MEM_INFO_VALID	BIT(0)
-#define     CXL_DVSEC_MEM_ACTIVE	BIT(1)
-#define     CXL_DVSEC_MEM_SIZE_LOW_MASK	GENMASK(31, 28)
-#define   CXL_DVSEC_RANGE_BASE_HIGH(i)	(0x20 + (i * 0x10))
-#define   CXL_DVSEC_RANGE_BASE_LOW(i)	(0x24 + (i * 0x10))
-#define     CXL_DVSEC_MEM_BASE_LOW_MASK	GENMASK(31, 28)
-
 #define CXL_DVSEC_RANGE_MAX		2
 
 /* CXL 2.0 8.1.4: Non-CXL Function Map DVSEC */
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 0241d1d7133a..36098e2b4235 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright(c) 2020 Intel Corporation. All rights reserved. */
+#include <cxl/cxl.h>
+#include <cxl/pci.h>
 #include <linux/unaligned.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/moduleparam.h>
@@ -906,6 +908,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	struct cxl_memdev *cxlmd;
 	int i, rc, pmu_count;
 	bool irq_avail;
+	u16 dvsec;
 
 	/*
 	 * Double check the anonymous union trickery in struct cxl_regs
@@ -926,13 +929,15 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	pci_set_drvdata(pdev, cxlds);
 
 	cxlds->rcd = is_cxl_restricted(pdev);
-	cxlds->serial = pci_get_dsn(pdev);
-	cxlds->cxl_dvsec = pci_find_dvsec_capability(
-		pdev, PCI_VENDOR_ID_CXL, CXL_DVSEC_PCIE_DEVICE);
-	if (!cxlds->cxl_dvsec)
+	cxl_set_serial(cxlds, pci_get_dsn(pdev));
+	dvsec = pci_find_dvsec_capability(pdev, PCI_VENDOR_ID_CXL,
+					  CXL_DVSEC_PCIE_DEVICE);
+	if (!dvsec)
 		dev_warn(&pdev->dev,
 			 "Device DVSEC not present, skip CXL.mem init\n");
 
+	cxl_set_dvsec(cxlds, dvsec);
+
 	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map);
 	if (rc)
 		return rc;
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
new file mode 100644
index 000000000000..aa4480d49e48
--- /dev/null
+++ b/include/cxl/cxl.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2024 Advanced Micro Devices, Inc. */
+
+#ifndef __CXL_H
+#define __CXL_H
+
+#include <linux/ioport.h>
+
+enum cxl_resource {
+	CXL_RES_DPA,
+	CXL_RES_RAM,
+	CXL_RES_PMEM,
+};
+
+struct cxl_dev_state;
+struct device;
+
+struct cxl_dev_state *cxl_accel_state_create(struct device *dev);
+
+void cxl_set_dvsec(struct cxl_dev_state *cxlds, u16 dvsec);
+void cxl_set_serial(struct cxl_dev_state *cxlds, u64 serial);
+int cxl_set_resource(struct cxl_dev_state *cxlds, struct resource res,
+		     enum cxl_resource);
+#endif
diff --git a/include/cxl/pci.h b/include/cxl/pci.h
new file mode 100644
index 000000000000..ad63560caa2c
--- /dev/null
+++ b/include/cxl/pci.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
+
+#ifndef __CXL_ACCEL_PCI_H
+#define __CXL_ACCEL_PCI_H
+
+/* CXL 2.0 8.1.3: PCIe DVSEC for CXL Device */
+#define CXL_DVSEC_PCIE_DEVICE					0
+#define   CXL_DVSEC_CAP_OFFSET		0xA
+#define     CXL_DVSEC_MEM_CAPABLE	BIT(2)
+#define     CXL_DVSEC_HDM_COUNT_MASK	GENMASK(5, 4)
+#define   CXL_DVSEC_CTRL_OFFSET		0xC
+#define     CXL_DVSEC_MEM_ENABLE	BIT(2)
+#define   CXL_DVSEC_RANGE_SIZE_HIGH(i)	(0x18 + ((i) * 0x10))
+#define   CXL_DVSEC_RANGE_SIZE_LOW(i)	(0x1C + ((i) * 0x10))
+#define     CXL_DVSEC_MEM_INFO_VALID	BIT(0)
+#define     CXL_DVSEC_MEM_ACTIVE	BIT(1)
+#define     CXL_DVSEC_MEM_SIZE_LOW_MASK	GENMASK(31, 28)
+#define   CXL_DVSEC_RANGE_BASE_HIGH(i)	(0x20 + ((i) * 0x10))
+#define   CXL_DVSEC_RANGE_BASE_LOW(i)	(0x24 + ((i) * 0x10))
+#define     CXL_DVSEC_MEM_BASE_LOW_MASK	GENMASK(31, 28)
+
+#endif
-- 
2.17.1